The reasons of air inflow less than water outflow are hysteresis phenomenon exiting in unsaturated flow, and air expands and diffuses as soon as it entering sand.
造成进气流量小于出水流量的原因主要是在非饱和流中存在滞后现象和进入砂层后的空气体积膨胀和扩散。
The Al element in the substrate diffuses into the brazing seam, forming a thin reaction layer in the interface region.
焊接母材中的Al元素向焊缝发生了扩散，在界面区形成了一层很薄的反应层。
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